奈米矽片銀/界面活性劑複合物於表面增強拉曼散射偵測之應用

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奈米矽片銀/界面活性劑複合物於表面增強拉曼散射偵測之應用

Nanohybrids of Silver Nanoparticle/Silicate Platelets/Surfactant for Surface-Enhanced Raman Scattering Detection

何俊瑩 , Masters　　Advisor：林江珍　　Co-advisor ：劉定宇

繁體中文

表面增強拉曼散射；奈米銀粒子；奈米矽片；界面活性劑； surface-enhanced Raman scattering ； silver nanoparticles ； nano silicate platelets ； surfactants.

Abstract │ Reference (95) │ Altmetrics

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Novel nanohybrids of silver nanoparticle (AgNP) on nano silicate platelet (NSP) with floating and three-dimensional (3D) hot-junctions (particularly in z-direction) properties were discovered for improving the stability of free nanoparticles and the mobility of conventional Ag depositing porous anodic aluminum oxide (Ag/AAO) rigid glass-based substrate in surface-enhanced Raman scattering (SERS) detection technology. The NSP in the dimension of 100 x 100 nm2 with 1-5 nm thickness was previously synthesized from the exfoliation of natural clays such as montmorillonite (MMT). Since the AgNPs are adsorbed on both sides of few nanometer-thick NSP, the geometric arrangement of AgNP/NSP may induce strong hot-junctions (z-direction) in reference to the pristine multi-layers Ag/MMT at the thickness of ~20 nm, which can be widely used in SERS detection of small molecules (adenine from DNA) and microorganism (S. aureus). Further, AgNP/NSP SERS substrate displays free floating mobility and optical transparency (less background interference), which inherently increase the contacted surface-area between the substrate and microorganisms, thus the enhancement of SERS sensitivity. 
On the other hand, the surface modulation of AgNP/NSP with a nonionic surfactant could be applied toward a variety of microorganisms including hydrophobic microbes, irregular-shaped microorganisms and larger biological cells due to their mutual specific surface interactions. The tri-component nanohybrids, Ag-NSP-surfactant (AgNP/NSS) were synthesized by in-situ reduction of AgNO3 into AgNP in the presence of NSP-surfactant hybrids (NSS) in aqueous. Owing to the presence of surfactant, the surface tension of AgNP/NSS had been adjusted and the affinity between AgNP/NSS and microorganisms had significantly increased for selectively detecting hydrophobic bacteria such as E. coli and mycobacteria, irregular-shaped microorganisms such as fungi and larger cells. With the surfactant fraction of AgNP/NSS increased, the SERS intensity of hydrophobic bacteria had dramatically enhanced comparing to the pristine AgNP/NSP and had an optimal value. 
Combination of hydrophobicity, substrate floating flexibility and 3D hot-junctions, the AgNP/NSS nanohybrids were tailored for selectively detecting irregular-shaped, hydrophobic microorganisms and larger biological cells, which provided a novel rapid label-free way for specific bio-detection.

Reference ( 95 ) 〈TOP〉

(1) Tiwari, V. S.; Oleg, T.; Darbha, G. K.; Hardy, W.; Singh, J. P.; Ray, P. C. Chemical Physics Letters 2007, 446, 77.
(2) Fleischmann, M.; Hendra, P. J.; McQuillan, A. J. Chemical Physics Letters 1974, 26, 163.
(3) Haynes, C. L.; Van Duyne, R. P. The Journal of Physical Chemistry B 2003, 107, 7426.
(4) Litorja, M.; Haynes, C. L.; Haes, A. J.; Jensen, T. R.; Van Duyne, R. P. The Journal of Physical Chemistry B 2001, 105, 6907.
(5) Dick, L. A.; McFarland, A. D.; Haynes, C. L.; Van Duyne, R. P. The Journal of Physical Chemistry B 2001, 106, 853.

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